Measuring coalignment of retroreflectors with large lateral incoming-outgoing beam offset

Daniel Schütze; David Farrant; Daniel A. Shaddock; Benjamin S. Sheard; Gerhard Heinzel; Karsten Danzmann

doi:10.1063/1.4866682

Measuring coalignment of retroreflectors with large lateral incoming-outgoing beam offset

Daniel Schütze, David Farrant, Daniel A. Shaddock, Benjamin S. Sheard, Gerhard Heinzel, Karsten Danzmann

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A method based on phase-shifting Fizeau interferometry is presented with which retroreflectors with large incoming-outgoing beam separations can be tested. The method relies on a flat Reference Bar that is used to align two auxiliary mirrors parallel to each other to extend the aperture of the interferometer. The method is applied to measure the beam coalignment of a prototype Triple Mirror Assembly of the GRACE Follow-On Laser Ranging Interferometer, a future satellite-to-satellite tracking device for Earth gravimetry. The Triple Mirror Assembly features a lateral beam offset of incoming and outgoing beam of 600 mm, whereas the acceptance angle for the incoming beam is only about ±2 mrad. With the developed method, the beam coalignment of the prototype Triple Mirror Assembly was measured to be 9 μrad with a repeatability of below 1 μrad.

Original language	English
Article number	035103
Journal	Review of Scientific Instruments
Volume	85
Issue number	3
DOIs	https://doi.org/10.1063/1.4866682
Publication status	Published - Mar 2014

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abstract = "A method based on phase-shifting Fizeau interferometry is presented with which retroreflectors with large incoming-outgoing beam separations can be tested. The method relies on a flat Reference Bar that is used to align two auxiliary mirrors parallel to each other to extend the aperture of the interferometer. The method is applied to measure the beam coalignment of a prototype Triple Mirror Assembly of the GRACE Follow-On Laser Ranging Interferometer, a future satellite-to-satellite tracking device for Earth gravimetry. The Triple Mirror Assembly features a lateral beam offset of incoming and outgoing beam of 600 mm, whereas the acceptance angle for the incoming beam is only about ±2 mrad. With the developed method, the beam coalignment of the prototype Triple Mirror Assembly was measured to be 9 μrad with a repeatability of below 1 μrad.",

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AU - Schütze, Daniel

AU - Farrant, David

AU - Shaddock, Daniel A.

AU - Sheard, Benjamin S.

AU - Heinzel, Gerhard

AU - Danzmann, Karsten

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AB - A method based on phase-shifting Fizeau interferometry is presented with which retroreflectors with large incoming-outgoing beam separations can be tested. The method relies on a flat Reference Bar that is used to align two auxiliary mirrors parallel to each other to extend the aperture of the interferometer. The method is applied to measure the beam coalignment of a prototype Triple Mirror Assembly of the GRACE Follow-On Laser Ranging Interferometer, a future satellite-to-satellite tracking device for Earth gravimetry. The Triple Mirror Assembly features a lateral beam offset of incoming and outgoing beam of 600 mm, whereas the acceptance angle for the incoming beam is only about ±2 mrad. With the developed method, the beam coalignment of the prototype Triple Mirror Assembly was measured to be 9 μrad with a repeatability of below 1 μrad.

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Measuring coalignment of retroreflectors with large lateral incoming-outgoing beam offset

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